Vulnerability in MIT krb5

[ Description ]Official description

MIT Kerberos 5 (krb5) through 1.22.2 contains a NULL pointer dereference in make_cred_list() in rd_cred.c that allows authenticated Kerberos clients to crash services by sending mismatched KRB-CRED arrays. Attackers can send forwarded credentials with more tickets than ticket_info entries through gss_accept_sec_context() to crash GSS-API acceptor services, causing denial of service.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund8 Oct 2026WID-SEC-2026-3836

  MIT Kerberos: Multiple vulnerabilities allow denial of service Translated from German

  CVE-2026-107778CVE-2026-107708

[ References ]References

• github.com/krb5/krb5
• github.com/krb5/krb5/blob/krb5-1.22.2-final/src/lib/krb5/krb/rd_cred.c
• github.com/krb5/krb5/commit/48afa9abb89ab2176bb20624d87d010b9984fc08
• github.com/krb5/krb5/commit/62196e2b269159a5465f5b8d0ed7cf6f29c3282a
• github.com/krb5/krb5/pull/1511
• www.vulncheck.com/advisories/mit-krb5-through-1.22.2-null-pointer-dereference-via-krb5-…